Mole conversion practice problems - FAIRHAVEN HIGH SCHOOL SCIENCE

[Pages:2]name: _______________

date: _______

mole conversions - practice problems

It is important to be able to convert between units of mass and volume measurement and `moles.' The mole is a unit for counting atoms and molecules representing 602,000,000,000,000,000,000,000 particles. This is often written as 6.02 ? 1023 particles and is known as `Avogadro's number.' Using the periodic table it is possible to calculate the `molar mass,' or the mass of a single mole of a substance. The `molar volume' is the volume of a single mole of gaseous substance. All gases have the same molar volume when measured at standard temperature and pressure or STP, which is 22.4 liters per mole.

mole conversion chart

amount (moles)

m1olmaroml ass 1 mol 22.4 L

6.022 ?10123mol

particles

mass (grams)

volume (liters)

particles

example:

Calculate the number of molecules in 1.62 grams of calcium chloride, CaCl2.

-develop a strategy:

grams moles particles

-calculate and solve:

1.62 g CaCl2

?

1 mol 111 g

?

6.022 ?1023 particles

1 mol

= =8.789.7?91?01201 2p1apraticrtliecsleosfoCf aCCalC2 l2

practice problems:

1. A sample of neon has a volume of 75.8 L at STP . Calculate the number of moles. 2. Calculate the mass of an 8.4 mole sample of iron. 3. Convert 0.45 g of sodium hydroxide, NaOH, into moles. 4. Calculate the number of molecules in a sample of carbon dioxide with a mass of 168.2 grams. 5. Calculate the number of moles of potassium nitrate, KNO3, in a sample with a mass of 85.2 grams. 6. Calculate the mass of 0.94 moles of sodium bicarbonate, NaHCO3. 7. Convert 7.8 liters of carbon tetrafluoride, CF4, to grams. 8. Calculate the mass of 3.47x1023 gold atoms. 9. Calculate the volume, in liters, of 7500 g of helium atoms. Assume STP conditions. 10. Calculate the number of particles in 5.0 grams of NaCl. 11. Calculate the mass of 5.0x1014 molecules of water. 12. Calculate the volume of 5.0 grams of NO gas at STP.

name: suggested answers

date: _______

mole conversions - practice problems

It is important to be able to convert between units of mass and volume measurement and `moles.' The mole is a unit for counting atoms and molecules representing 602,000,000,000,000,000,000,000 particles. This is often written as 6.02 ? 1023 particles and is known as `Avogadro's number.' Using the periodic table it is possible to calculate the `molar mass,' or the mass of a single mole of a substance. The `molar volume' is the volume of a single mole of gaseous substance. All gases have the same molar volume when measured at standard temperature and pressure or STP, which is 22.4 liters per mole.

mole conversion chart

amount (moles)

m1olmaroml ass 1 mol 22.4 L

6.022 ?10123mol

particles

mass (grams)

volume (liters)

particles

example:

Calculate the number of molecules in 1.62 grams of calcium chloride, CaCl2.

-develop a strategy:

grams moles particles

-calculate and solve:

1.62 g CaCl2

?

1 mol 111 g

?

6.022 ?1023 particles

1 mol

practice problems:

1. A sample of neon has a volume of 75.8 L at STP . Calculate the number of moles. 3.38 mol Ne 2. Calculate the mass of an 8.4 mole sample of iron. 469.14 g Fe 3. Convert 0.45 g of sodium hydroxide, NaOH, into moles. 0.0112 mol NaOH 4. Calculate the number of molecules in a sample of carbon dioxide with a mass of 168.2 grams. 2.30x1024 molecules CO2 5. Calculate the number of moles of potassium nitrate, KNO3, in a sample with a mass of 85.2 grams. 0.843 mol KNO3 6. Calculate the mass of 0.94 moles of sodium bicarbonate, NaHCO3. 78.96 g NaHCO3 7. Convert 7.8 liters of carbon tetrafluoride, CF4, to grams. 30.64 g CF4 8. Calculate the mass of 3.47x1023 gold atoms. 113.52 g Au 9. Calculate the volume, in liters, of 7500 g of helium atoms. Assume STP conditions. 42000 L He 10. Calculate the number of particles in 5.0 grams of NaCl. 5.15x1022 particles NaCl 11. Calculate the mass of 5.0x1014 molecules of water. 1.49x10-8 g H2O 12. Calculate the volume of 5.0 grams of NO gas at STP. 3.73 L NO

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